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111mathA
Author:
Wu Xiao-Ren
GeoGebra
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兩位數加法
球体的体积推导（优化版）
画直线等分三角形的面积
【案例】2013年安徽高考15题
畫出對稱圖形
Discover Resources
雙曲幾何
Calculus
日照杆影演示
MFS: Rebound 4
Completing the square(配方法)
Discover Topics
Curve Sketching
Right Triangles
Algebra
Equations
Conic Sections